CN114649154A

CN114649154A - Switch mechanism and electric tool

Info

Publication number: CN114649154A
Application number: CN202011518619.3A
Authority: CN
Inventors: 陈郁
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2022-06-21
Anticipated expiration: 2040-12-21
Also published as: CN114649154B

Abstract

The invention belongs to the technical field of electric tools, and relates to a switch mechanism and an electric tool. The switch mechanism includes a housing, a switch, and a trigger. The casing has a mounting cavity. Both ends of the trigger may be depressed relative to the housing. The switch mechanism further comprises a limiting piece and an inner driving piece. The locating part sets up in the installation cavity. The inner driving piece is arranged on one side of the trigger facing the installation cavity, the inner driving piece can slide relative to the trigger, and two ends of the inner driving piece can be abutted to the switch and the limiting piece respectively. The trigger is provided with the arch, the part between the driving piece both ends in the protruding butt, and the one end of trigger is equipped with the holding tank to driving piece in holding when the one end of pressing the trigger. The electric tool comprises the switch mechanism. During assembly, the inner driving part is placed into the containing cavity, and then the trigger is connected to the shell. The link of pin joint point counterpoint and pin joint of interior driving piece has been saved, has simplified the process of assembly.

Description

Switch mechanism and electric tool

Technical Field

The invention belongs to the technical field of electric tools, and particularly relates to a switch mechanism and an electric tool.

Background

In order to allow an operator to operate a switch of a power tool at different grip positions, a power tool has been disclosed in which a switch mechanism includes a trigger connected to a housing of the power tool. An inner drive member is pivotally connected at its middle portion to the trigger. When the front end of the trigger is pressed, the switch is triggered by the inner driving piece; when the rear end of the trigger is pressed, the switch is directly triggered.

During manufacturing, the middle pivot point of the inner driving piece and the matching relationship between the two end points and the trigger need to be considered. During assembly, the inner driving part needs to be pre-installed and aligned, and then the middle part of the inner driving part is pivoted on the trigger through the pivot connection part. The existing electric tool has the defects of more switch mechanism parts, high manufacturing cost and complex assembly.

Disclosure of Invention

It is an object of the present invention to provide a switch mechanism that simplifies the assembly process of the switch mechanism.

In order to achieve the purpose, the invention adopts the following technical scheme:

a switch mechanism comprising:

a housing having a mounting cavity;

a switch disposed in the mounting cavity;

the trigger is connected to the shell, and both ends of the trigger can be pressed relative to the shell;

the switch mechanism further includes:

the limiting piece is arranged in the installation cavity;

the inner driving piece is arranged on one side, facing the installation cavity, of the trigger, can slide relative to the trigger, and two ends of the inner driving piece can be abutted to the switch and the limiting piece respectively;

the trigger is provided with the arch, protruding butt the part between interior driving piece both ends, the one end of trigger is equipped with the holding tank to press the trigger hold when the one end interior driving piece.

Preferably, in the above switch mechanism, the accommodating groove is an arc-shaped groove or an inclined line groove.

Preferably, in the above switch mechanism, the inner driving member has a limiting protrusion, and the limiting protrusion is in sliding fit with the receiving groove.

Preferably, in the above switch mechanism, one side of the trigger facing the installation cavity is provided with an accommodation cavity, the protrusion is located in the accommodation cavity, and at least part of the inner driving element is located in the accommodation cavity.

Preferably, in the above switch mechanism, the accommodating groove is defined by an inner wall of the accommodating chamber and two ribs provided on the inner wall.

Preferably, in the above switch mechanism, the receiving groove is formed by an inner wall of the trigger being recessed, or the receiving groove is a through hole provided on the trigger.

Preferably, in the above switch mechanism, the inner driving member has a sliding groove, and the protrusion is limited in the sliding groove.

Preferably, in the above switch mechanism, the switch mechanism further comprises a locking assembly, and the locking assembly locks and unlocks the inner driving member to lock and unlock the trigger.

Preferably, in the above switch mechanism, the inner driving member has a locking block having a locking hole, and the locking assembly has a free state away from the locking block, a first locking state abutting against the locking block, and a second locking state in plug-in fit with the locking hole.

Another object of the present invention is to provide a power tool to simplify the assembly process of the switch mechanism.

an electric tool comprises a power input assembly, a power output assembly and the switch mechanism, wherein the power input assembly is arranged on a machine shell, the power output assembly is at least partially arranged on the machine shell, the power input assembly drives the power output assembly, and a trigger controls the power input assembly to be opened or closed.

The switch mechanism and the electric tool have the advantages that: during assembly, the inner driving part is placed on one side of the trigger facing the installation cavity, the inner driving part is placed into the accommodating cavity, and the trigger is connected to the machine shell. Compared with the prior art, the pin joint point alignment and pin joint links of the inner driving piece are omitted, and therefore the assembling process is simplified.

Drawings

FIG. 1 is a state diagram of a power tool according to an embodiment of the present invention when a trigger is not pressed;

FIG. 2 is a cross-sectional view of a switch mechanism of an embodiment of the present invention with the trigger not depressed;

FIG. 3 is a state diagram of the electric power tool of the embodiment of the present invention when one end of the trigger is pressed;

FIG. 4 is a cross-sectional view of the switch mechanism of the embodiment of the present invention with one end of the trigger depressed;

FIG. 5 is a state diagram of the electric power tool according to the embodiment of the present invention when the other end of the trigger is pressed

FIG. 6 is a cross-sectional view of the switch mechanism of the embodiment of the invention with the other end of the trigger depressed;

FIG. 7 is an exploded perspective view of a switch mechanism according to an embodiment of the invention;

FIG. 8 is a cross-sectional view of the trigger of the switch mechanism of the embodiment of the present invention;

FIG. 9 is a perspective view of the trigger of the switch mechanism of the embodiment of the present invention;

FIG. 10 is an assembly view of the internal driving member and the housing of the switch mechanism according to the embodiment of the present invention.

The component names and designations in the drawings are as follows:

the power tool comprises a machine shell 10, an installation cavity 11, a limiting piece 20, a switch 30, a trigger 40, an accommodating cavity 41, a convex rib 42, a protrusion 43, an accommodating groove 44, a first rotating protrusion 45, a second rotating protrusion 46, a side plate 47, an inner driving piece 50, a limiting protrusion 51, a sliding groove 52, a locking block 53, a locking hole 531, a locking assembly 60, a locking protrusion 61, a driving mechanism 70, a power output assembly 80 and an electric tool 100.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

As shown in fig. 1, the present embodiment discloses an electric power tool 100, and the electric power tool 100 includes a power input assembly, a power output assembly 80, and a switch mechanism, the power input assembly being mounted in a mounting cavity 11 of a housing 10. The power input assembly comprises a motor, a gear box and other transmission parts. The power take-off assembly 80 is at least partially mounted to the housing 10, the power take-off assembly 80 comprising a working head. For example, when the power tool 100 is an electric drill, the working head is a drill bit. In other alternative embodiments, the power tool 100 may also be a hammer, angle grinder, screwdriver, power saw, etc. The motor drives the power take-off assembly 80 through a transmission.

The switch mechanism includes a trigger 40 connected to the housing 10 and a switch 30 located in the mounting chamber 11. The trigger 40 controls the turning on or off of the motor. As shown in fig. 1 to 6, both ends of the trigger 40 of the present embodiment are respectively rotatable with respect to the housing 10, and both ends of the trigger 40 can be pressed. Specifically, as shown in fig. 7 and 9, both ends of the trigger 40 have a first rotating protrusion 45 and a second rotating protrusion 46, respectively, and the first rotating protrusion 45 and the second rotating protrusion 46 are rotatably mounted to the housing 10, respectively. One end of the trigger 40 can rotate around the first rotation protrusion 45 and the other end can rotate around the second rotation protrusion 46. Pressing both ends of the trigger 40 triggers the switch 30, which activates the motor. In other alternative embodiments, trigger 40 can slide relative to housing 10, and the motor can also be activated by depressing the middle portion of trigger 40.

The power tool 100 of the present embodiment may be hand-held or non-hand-held. With respect to the hand-held electric power tool 100, the housing 10 is provided with a grip portion to facilitate gripping by an operator. To facilitate operator control of the hand held power tool 100, the trigger 40 is typically disposed at or near the grip portion.

As shown in fig. 2, 4 and 6, the switch mechanism of the present embodiment further includes a limiting member 20 and an internal driving member 50, the limiting member 20 is disposed in the installation cavity 11, and the limiting member 20 is connected to the housing 10. The limiting member 20 and the casing 10 may be connected by a connecting member such as a screw, and the limiting member 20 may be integrally formed with the casing 10.

Inner drive member 50 is disposed on the side of trigger 40 facing mounting cavity 11. The inner drive member 50 of this embodiment may be a metal plate extending along a straight line or a straight plate of other hard material. The inner driving member 50 can slide relative to the trigger 40, and two ends thereof can abut against the switch 30 and the limiting member 20, respectively. The inner driving member 50 of the present embodiment always abuts against the switch 30 and the limiting member 20, which is beneficial to saving space and improving the reliability of the trigger 40. In other alternative embodiments, both ends of inner drive member 50 may be spaced a distance from switch 30 and limit stop 20, respectively, when trigger 40 is not depressed.

Trigger 40 is provided with a projection 43, projection 43 abutting the portion of inner drive member 50 between its ends, inner drive member 50 being a sliding fit with projection 43. The surface of the protrusion 43 contacting the inner driving member 50 may be a circular arc surface, i.e. the protrusion 43 is preferably a protrusion 43 with a circular arc surface, so as to improve the smoothness of mutual sliding between the inner driving member 50 and the protrusion 43. Specifically, the projection 43 is provided at a middle position of the trigger 40, and the projection 43 abuts against a middle position of the inner drive member 50. The middle position of the inner drive member 50 may specifically be: the center point of the inner drive member 50 extends to both sides over 25% of the total length of the inner drive member 50.

One end of trigger 40 is provided with a receiving slot 44 to receive inner drive element 50 when one end of trigger 40 is depressed. Specifically, the receiving slot 44 has a length such that when one end of the trigger 40 is pressed, the receiving slot 44 rotates with one end of the trigger 40, and in the process, one end of the inner driving member 50 is always located in the receiving slot 44, and one end of the inner driving member 50 is always abutted by the stopper 20.

Based on the above structure, the process of pressing the trigger 40 to trigger the switch 30 is:

as shown in fig. 2 and 4, when one end of the trigger 40 is pressed, the protrusion 43 is located closer to the mounting cavity 11 than the original position, and since one end of the inner driving member 50 is always abutted by the limiting member 20, the protrusion 43 drives the inner driving member 50, so that the other end of the inner driving member 50 tilts toward the switch 30 to trigger the switch 30. The original positions here are: the position of the projection 43 when the trigger 40 is not depressed.

As shown in fig. 2 and 6, when the other end of the trigger 40 is pressed, the other end of the trigger 40 activates the switch 30. Since inner drive member 50 is located between switch 30 and trigger 40, it can also be considered that the other end of trigger 40 pushes the other end of inner drive member 50 to activate switch 30.

Based on the above structure, in the present embodiment, when assembling, it is only necessary to place the inner driving member 50 on the side of the trigger 40 facing the installation cavity 11, align the limiting protrusion 51 with the receiving groove 44, place the inner driving member 50 in the receiving cavity 41 of the trigger 40, and then place the trigger 40 in the installation cavity 11 to connect to the housing. In fact, because the dimensions of the inner driving member 50 and the receiving cavity 41 are matched, the limiting protrusion 51 is aligned with the receiving slot 44 while the inner driving member 50 is inserted into the receiving cavity 41.

Compared with the prior art, the link of pin joint counterpoint and pin joint of the inner driving piece 50 is saved, thereby simplifying the process of assembly and solving the problem of switch failure caused by misalignment of the pin joint of the inner driving piece. In addition, the cost of manufacturing the switch mechanism is also reduced.

The receiving slot 44 of this embodiment is an arcuate slot having a particular arc and length that is related to the degree of rotation and rotational travel of one end of the trigger 40. In other alternative embodiments, the receiving slot 44 can be a diagonal slot, and pressing one end of the trigger 40 can also tilt the other end of the inner driving member 50 toward the switch 30 to trigger the switch 30.

As shown in fig. 7, the inner driving member 50 has a limiting protrusion 51 at one end thereof, the limiting protrusion 51 extends perpendicular to the length direction of the inner driving member 50, and the limiting protrusion 51 is located in the receiving groove 44. The receiving groove 44 slides with respect to the stopper protrusion 51 as one end of the trigger 40 moves. The limiting protrusion 51 may be a cylindrical protrusion to improve the smoothness of the receiving groove 44 and the limiting protrusion 51 in sliding relative to each other and reduce the abrasion of the limiting protrusion 51. In other alternative embodiments, the limiting protrusion 51 may also be a spherical structure.

In the present embodiment, as shown in fig. 8 and 9, the side of the trigger 40 facing the mounting cavity 11 has a receiving cavity 41, the protrusion 43 is located in the receiving cavity 41, and at least a portion of the inner driving member 50 is located in the receiving cavity 41. Specifically, the center of the accommodation chamber 41 has a rib, and one end of the rib facing the mounting chamber 11 forms a projection 43. The inner drive member 50 has a certain width, and therefore, the projection 43 extends in the width direction of the inner drive member 50 to reliably abut against the inner drive member 50. Based on the structure, when the inner driving element 50 is assembled, the inner driving element 50 can be abutted by the protrusion 43 and the stopper 20 and the switch 30 by only placing the inner driving element 50 in the accommodating cavity 41, so that the installation of the inner driving element 50 is completed, and the installation of the inner driving element 50 is more convenient. In addition, the cost of manufacturing the switch mechanism is further reduced.

In this embodiment, the accommodating groove 44 is defined by an inner wall of the accommodating chamber 41 and two ribs 42 provided on the inner wall. At this time, the receiving groove 44 can simultaneously receive the one end of the inner driving member 50 and the stopper 20 when the one end of the trigger 40 is pressed.

In other alternative embodiments, receiving slot 44 is formed by an internal wall depression of trigger 40, or receiving slot 44 is a through hole provided on trigger 40. Specifically, as shown in fig. 9, an arc-shaped through hole may be provided in the side plate 47 at one end of the trigger 40 to receive the stopper protrusion 51 of the inner driving member 50. At this time, the receiving groove 44 cannot receive the stopper 20 when one end of the trigger 40 is pressed. Therefore, it can be seen that the accommodating groove 44 is defined by the inner wall of the accommodating cavity 41 and the two ribs 42 disposed on the inner wall, which is beneficial to reducing the occupied space of the switch mechanism.

In this embodiment, as shown in fig. 10, a sliding slot 52 is formed on a side of the inner driving member 50 away from the mounting cavity 11, and the protrusion 43 is limited by the sliding slot 52. Specifically, two long sides of the inner driving member 50 are connected with ribs, and the two ribs and the inner driving member 50 enclose a sliding groove 52. The ribs can enhance the strength of the inner drive member 50. In other alternative embodiments, the slide slot 52 may not be provided, and in this case, the inner driving member 50 and the protrusion 43 can still be reliably abutted and slidably engaged due to the inner driving member 50 being retained in the accommodating cavity 41.

As shown in fig. 7, the side of the inner driving member 50 facing the mounting cavity 11 is also provided with two ribs, and the two ribs and the inner driving member 50 form a groove for accommodating a part of the switch 30, so as to further improve the reliability of the inner driving member 50 for driving the switch 30. The two ribs here further increase the strength of the inner drive member 50. The ribs on one side of the inner drive element 50 facing the mounting space 11 and facing away from the mounting space 11 are formed by a single plate. The plate is perpendicular to the width direction of the inner drive member 50 and is attached to the long side of the inner drive member 50. The plate may be integrally formed with the inner drive member 50 or may be attached by welding.

In this application, one end of the inner driving member 50 is referred to as one end close to the limiting member 20, and the other end is referred to as one end close to the switch 30. One end of the trigger 40 is referred to as the end near the limit 20, and the other end is referred to as the end near the switch 30.

As shown in fig. 7, in the present embodiment, the switch mechanism further includes a locking assembly 60 and a driving mechanism 70, and the locking assembly 60 and the driving mechanism 70 are both mounted in the mounting cavity 11 and are disposed near the switch 30. Accordingly, the housing 10 is externally provided with a locking button (not shown) for operation by an operator. For example, the lock button may be disposed adjacent the trigger 40. The locking button is operated to drive the locking assembly 60 via the drive mechanism 70, thereby causing the locking assembly 60 to lock and unlock the inner drive member 50 to lock and unlock the trigger 40. Further, the inner driving member 50 has a locking block 53, the locking block 53 has a locking hole 531, and the locking member 60 has a free state away from the locking block 53, a first locking state abutting against the locking block 53, and a second locking state in plug-in engagement with the locking hole 531. Specifically, the lock block 53 is provided at one long edge of the inner drive member 50, and is perpendicular to the width direction of the inner drive member 50. The lock hole 531 of the present embodiment is a hole of a combined shape surrounded by straight lines and curved lines. In other alternative embodiments, the locking hole 531 may also be a rectangular hole or a circular hole, etc.

Specifically, the lock assembly 60 includes a lock projection 61, and the lock projection 61 is engaged with the lock block 53 to have a free state away from the lock block 53, a first locked state abutting against the lock block 53, and a second locked state in plug-in engagement with the lock hole 531.

When the lock knob is operated so that the lock projection 61 is away from the lock block 53, both ends of the trigger 40 are pushed to start the motor. After release of the trigger 40, the trigger 40 is returned to its original position under the action of the spring, causing the motor to be turned off.

When the lock knob is operated so that the lock projection 61 abuts against the lock block 53, the trigger 40 is not pressed, and the electric power tool 100 is in a non-working safety state.

When the lock knob is operated such that the lock projection 61 enters the lock hole 531, the motor is in an on state, and at this time, the motor is maintained in the on state even after the trigger 40 is released. The operator does not need to press the trigger 40 all the time, improving the convenience of operation.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A switch mechanism comprising:

a housing having a mounting cavity;

a switch disposed in the mounting cavity;

characterized in that, the switching mechanism still includes:

the limiting piece is arranged in the installation cavity;

the trigger is provided with the arch, protruding butt the part between the interior driving piece both ends, the one end of trigger is equipped with the holding tank to press the trigger hold when the one end interior driving piece.

2. The switch mechanism of claim 1, wherein the receiving slot is an arcuate slot or a diagonal slot.

3. The switch mechanism of claim 1 wherein said inner drive member has a limit projection that is a sliding fit with said receiving slot.

4. The switch mechanism of claim 1 wherein the side of said trigger facing said mounting cavity has a receiving cavity, said protrusion being located in said receiving cavity, at least a portion of said inner drive member being located in said receiving cavity.

5. The switch mechanism according to claim 4, wherein said receiving groove is defined by an inner wall of said receiving chamber and two ribs provided on said inner wall.

6. The switch mechanism according to claim 4, wherein the receiving groove is formed by an inner wall depression of the trigger, or the receiving groove is a through hole provided on the trigger.

7. The switch mechanism of claim 1 wherein said inner drive member has a slot and said projection is captured by said slot.

8. The switch mechanism of claim 1, further comprising a locking assembly that locks and unlocks the inner drive to lock and unlock the trigger.

9. The switch mechanism of claim 8, wherein the inner drive member has a lock block with a lock hole, and the lock assembly has a free state away from the lock block, a first locked state abutting the lock block, and a second locked state in mating engagement with the lock hole.

10. A power tool comprising a power input assembly mounted to said housing, a power output assembly mounted at least in part to said housing, said power input assembly driving said power output assembly, and a switch mechanism according to any one of claims 1 to 9, said trigger controlling the opening or closing of said power input assembly.